Improvement in ox-yokes



-N'iran States JOHN H. WHlTNEY, OF SANDlSFlELD, MASSACHUSETTSIMPROVEMENT IN (DX-YKES.

Specification forming part of Letters Patent N0. d. dated March 7,1865:l

lowing is a full and exact description thereof,.

reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

The nature of my invention consists inconstructing and arranging thebow-block and its attachments through' which the bows pass in such amanner that the yoke may readily bel adjusted to an immovable how-slide,or mo'vable, or so as to give either ox the long or short arm of -thelever, as desired.

The natureof my invention I will give, so as to enable others skilled inthe art to make and use it. lt is as follows: The neck-block of the yokeH H, through which the bows are set, is so arranged upon a rectangularframe as to. approach toward and recede from -thevcenter of the yoke,severally guided by a the pinion between.

By a screw (as seen in the drawing) D, the arm of the lever is readilyregulated. That screw goes through a slot in the end of the geared rackinto a nut on the opposite side oi" the rack. By loosening this screwthe rack is.

moved so as to vgive either ox the long or short lever, the other ox thecoi-responding short or long lever. lWhile the. screw is tight each oxsustains his relative length of lever however the'bow-blooks'move.

In the vaccompanying drawings, A is a side View of' the yoke. B is aAview ot' the geared rack as seen on the under side of the yoke, and thebow-slide attached to the cap with C is the ring; and staple. 'D is thefulerum-screw which regulates the lever by which each ox iseoinpelledto` Work. E is a set thumb-screw to prevent or otherwise thebow-slides from moving. Fis the slot through which the screw operates t0determine the length of lever by which each 0X must work.

Ido not claim the vdevices, for the simultaneous movement of thebow-slides, as such are not new.

I claim- The adjustiable fulcruin-screw D and the thumb-screw E incombination with the bowslides H, as and for the purposes set forth. l

, JOHN'H. WHITNEY.

Witnesses:

HARVEY BENTS, HARRISON J. VVrrI'iru-Ark

